1. Department of Biology; Northampton Community College Monroe Campus; Tannersville PA, 18372 U.S.A.
2. Department of Biology; Metropolitan State University of Denver; Denver CO, 80217 U.S.A.
3. Biosciences Department; Minnesota State University Moorhead; Moorhead MN, 56563 U.S.A.
4. Department of Biological Sciences; Lehigh University; Bethlehem PA, 18015 U.S.A.